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Hans de Goede cf800f2b63 ACPI / scan: Create platform device for INT33FE ACPI nodes [ Upstream commit `589edb56b4` ] Bay and Cherry Trail devices with a Dollar Cove or Whiskey Cove PMIC have an ACPI node with a HID of INT33FE which is a "virtual" battery device implementing a standard ACPI battery interface which depends upon a proprietary, undocument OpRegion called BMOP. Since we do have docs for the actual fuel-gauges used on these boards we instead use native fuel-gauge drivers talking directly to the fuel-gauge ICs on boards which rely on this INT33FE device for their battery monitoring. On boards with a Dollar Cove PMIC the INT33FE device's resources (_CRS) describe a non-existing I2C client at address 0x6b with a bus-speed of 100KHz. This is a problem on some boards since there are actual devices on that same bus which need a speed of 400KHz to function properly. This commit adds the INT33FE HID to the list of devices with I2C resources which should be enumerated as a platform-device rather then letting the i2c-core instantiate an i2c-client matching the first I2C resource, so that its bus-speed will not influence the max speed of the I2C bus. This fixes e.g. the touchscreen not working on the Teclast X98 II Plus. The INT33FE device on boards with a Whiskey Cove PMIC is somewhat special. Its first I2C resource is for a secondary I2C address of the PMIC itself, which is already described in an ACPI device with an INT34D3 HID. But it has 3 more I2C resources describing 3 other chips for which we do need to instantiate I2C clients and which need device-connections added between them for things to work properly. This special case is handled by the drivers/platform/x86/intel_cht_int33fe.c code. Before this commit that code was binding to the i2c-client instantiated for the secondary I2C address of the PMIC, since we now instantiate a platform device for the INT33FE device instead, this commit also changes the intel_cht_int33fe driver from an i2c driver to a platform driver. This also brings the intel_cht_int33fe drv inline with how we instantiate multiple i2c clients from a single ACPI device in other cases, as done by the drivers/platform/x86/i2c-multi-instantiate.c code. Reported-and-tested-by: Alexander Meiler <alex.meiler@protonmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>		2019-12-01 09:16:35 +01:00
arch	kprobes, x86/ptrace.h: Make regs_get_kernel_stack_nth() not fault on bad stack	2019-12-01 09:16:35 +01:00
block	blok, bfq: do not plug I/O if all queues are weight-raised	2019-11-20 18:46:44 +01:00
certs	export.h: remove VMLINUX_SYMBOL() and VMLINUX_SYMBOL_STR()	2018-08-22 23:21:44 +09:00
crypto	crypto: testmgr - fix sizeof() on COMP_BUF_SIZE	2019-12-01 09:16:13 +01:00
Documentation	net: phy: mdio-bcm-unimac: Allow configuring MDIO clock divider	2019-11-20 18:47:14 +01:00
drivers	ACPI / scan: Create platform device for INT33FE ACPI nodes	2019-12-01 09:16:35 +01:00
firmware	kbuild: remove all dummy assignments to obj-	2017-11-18 11:46:06 +09:00
fs	xfs: clear ail delwri queued bufs on unmount of shutdown fs	2019-12-01 09:16:34 +01:00
include	cpuidle: menu: Fix wakeup statistics updates for polling state	2019-11-24 08:20:07 +01:00
init	initramfs: don't free a non-existent initrd	2019-10-01 08:26:09 +02:00
ipc	ipc/mqueue.c: only perform resource calculation if user valid	2019-08-06 19:06:52 +02:00
kernel	printk: fix integer overflow in setup_log_buf()	2019-12-01 09:16:14 +01:00
lib	idr: Fix idr_get_next race with idr_remove	2019-11-24 08:19:11 +01:00
LICENSES	LICENSES: Remove CC-BY-SA-4.0 license text	2018-10-18 11:28:50 +02:00
mm	mm/ksm.c: don't WARN if page is still mapped in remove_stable_node()	2019-12-01 09:16:11 +01:00
net	net: fix warning in af_unix	2019-12-01 09:16:33 +01:00
samples	mei: samples: fix a signedness bug in amt_host_if_call()	2019-11-24 08:19:50 +01:00
scripts	scripts/setlocalversion: Improve -dirty check with git-status --no-optional-locks	2019-11-06 13:05:27 +01:00
security	ima: fix freeing ongoing ahash_request	2019-10-11 18:21:11 +02:00
sound	ASoC: tegra_sgtl5000: fix device_node refcounting	2019-12-01 09:16:31 +01:00
tools	tools: gpio: Correctly add make dependencies for gpio_utils	2019-12-01 09:16:09 +01:00
usr	kbuild: clean compressed initramfs image	2019-10-07 18:57:16 +02:00
virt	kvm: arm/arm64: Fix stage2_flush_memslot for 4 level page table	2019-11-24 08:19:31 +01:00
.clang-format	clang-format: Set IndentWrappedFunctionNames false	2018-08-01 18:38:51 +02:00
.cocciconfig
.get_maintainer.ignore
.gitattributes	.gitattributes: set git diff driver for C source code files	2016-10-07 18:46:30 -07:00
.gitignore	Kbuild updates for v4.17 (2nd)	2018-04-15 17:21:30 -07:00
.mailmap	libnvdimm-for-4.19_misc	2018-08-25 18:13:10 -07:00
COPYING	COPYING: use the new text with points to the license files	2018-03-23 12:41:45 -06:00
CREDITS	9p: remove Ron Minnich from MAINTAINERS	2018-08-17 16:20:26 -07:00
Kbuild	Kbuild updates for v4.15	2017-11-17 17:45:29 -08:00
Kconfig	kconfig: move the "Executable file formats" menu to fs/Kconfig.binfmt	2018-08-02 08:06:55 +09:00
MAINTAINERS	USB: rio500: Remove Rio 500 kernel driver	2019-10-17 13:44:47 -07:00
Makefile	Linux 4.19.86	2019-11-24 08:21:09 +01:00
README	Docs: Added a pointer to the formatted docs to README	2018-03-21 09:02:53 -06:00

README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.